There is no suc format, however, mention name of the court at the bottom of complaint, then mention the full description of complainant followed by accused persons, then sections of complaint.

Then start complainant and go on systematically, sequence and date-wise till its ends. Then write specific paragraph what effort was made to get the matter lodged wit concerned police station and which reasons led to filing the complaint belatedly, if any. At last pray for the trial.

better take help of a lawyer. Legal procedure is not a joke but a serious approach to seek justice. Sorry sir but you are sounding like how to perform an operation upon oneself in case of a stomach ache.